high quality aluminum housing (025-090) high quality iron cast from 110-150 high quality Tin bronze worm hweel low weight worm reducer,worm gear reducer,small worm gear reducer:speed ratio:7.5,10,15,20,25,30,40,50,60,80,1001.size:center to center spacing:025,030,040,050,063,075,090,110,130,1502.low eight,small size can save place for mounting3.high quality aluminum alloy housing4.high mechanical ...